| T.C.S. is taking in consideration the difference in the creation of color images on film and tape. Unlike film where due to the virtue of 3 layers, and the nature of creating a color image, a "correct" grey scale is enough to assume that all colors will fall in place. The video image, however, even if set up properly by contrast, may have absolutely the wrong color.
This is why the G& D scale has 27 colors - 24 of which form the color spectrum from aqua-blue (#1) through all cyan, green, yellow, orange, red, violet, magenta, blue color up to aqua marine (#24). The 24 field color spectrum is designed to compare the color sensitivity and color bias of different stocks. By numbering each segment of the color chart, the colors can be compared not only by verbal description, but also by using the assigned numbers. This feature is designed to facilitate communication between the cinematographer and the telecine colorist and/or the lab timer.
Three other colors include optical wedges or linear blends - skin tone, blue sky and greenery . Research indicates that while the human eye can distinguish between thousands of different colors and hues , only a few colors exist that people readily agree on and experience practically every day. As a new element of the Thorough Control System, the GAMMA & DENSITY introduces "Easily Recognizable Colors" (E.R.C.) - skin tone, blue sky and greenery.
The GAMMA=1t (on a film strip) chart includes a red strip below the 45 IRE gray strip designed to enable the telecine colorist to set up the color red on the vectorscope. Extensive testing determined that the red we are using is the closest possible color to any of those used for reference on a vectorscope. By setting the red reference, the rest of the colors will be aligned according to the spectral sensitivities of the particular film stock
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The other systems makes no reference to color at all. |
